Had the opportunity to play a stereo and ultra Hi side by side. The Ultra Hi was a 2002 and Stereo a 2001. The stereo had more volume overall (bridged) and ran cooler than the ultra hi. Just wondering if anyone has had this experience. My thought is that the stereo runs more efficiently with 2 350 watt power amps than the 1 1200 watt amp of the ultra. Others on this forum seem to think the Ultra Hi has more punch and headroom than any of Walter's other amps. I just didn't find this to be the case.